Topolganger

noun
The alternate identity of a place co-located in the Cleaved cities of Besel and Ul Qoma.
Origin
Portmanteau of ‘topography’ and ‘doppelganger’.
Source
The City & The City

Transenlightenment

noun
A state of neural communion attained by a group of people using artificial implants.
Source
Great Wall of Mars

Translatomat

noun
A universal language translator for speech.
Origin
Pairing of ‘translate’ and Automat (machine).
Source
Changing Planes

Tream

noun
A virtual reality scenario experienced via direct interface with the brain.
Origin
Portmanteau of ‘transmit’ and ‘dream’.
Source
The Algebraist

Tricorder

noun
A multifunction hand-held device used for sensor scanning, analysis and recording of data.
Origin
Formed from triplus (triple) and ‘recorder’.
Source
Star Trek: The Original Series

Trid

adjective
Having or appearing to have length, breadth, and depth.
Origin
Abbreviation of ‘tri-dimensional’.
Source
Embassytown

Trimensional

adjective
Having or appearing to have length, breadth, and depth: a three-dimensional object.
Origin
Derived from triplus (triple).
Source
Foundation

Trollburg

noun
A large animal that can house a population of occupants in symbiosis.
Origin
Portmanteau of troll (a giant supernatural being) and burg (town).
Source
Two Moons

Truedeath

noun
Death of an uploaded mind without a backup.
Source
The Fractal Prince

Urbapt

noun
An apartment in a high-density urban zone.
Source
True Names

Urbmon

noun
A tower of superstressed concrete three kilometres high; home to 800,000 people.
Origin
Abbreviation of ‘urban monad’.
Source
The World Inside

Verdash

verb
To regret.
Source
Of Time and Third Avenue